<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>文本淡化效果</title>
    <style>
        .fade-enter-active, .fade-leave-active {
  transition: opacity .5s;
}
.fade-enter, .fade-leave-to /* .fade-leave-active below version 2.1.8 */ {
  opacity: 0;
}

    </style>
    <script src="./js/vue.js"></script>
</head>
<body>
    <!-- 创建一个div id为demo 挂载点 -->
    <div id="demo">
        <button v-on:click="show = !show">切换</button>
        <transition name="fade">
            <p v-if="show">Hello World</p>
        </transition>
    </div>
    <!-- 使用JavaScript 脚本 -->
     <script type="text/javascript">
        new Vue({
            el: "#demo",
            data: {
                show: true
            },
            
     });
     </script>
</body>
</html>